Sesterterpenes from a common marine sponge, Hyrtios erecta

Area of Science:

• Marine Natural Products Chemistry
• Organic Chemistry
• Chemical Ecology

Background:

• Marine sponges are a rich source of structurally diverse secondary metabolites.
• Hyrtios erecta is known to produce various bioactive compounds.
• Sesterterpenes are a class of C20 terpenoids with diverse biological activities.

Purpose of the Study:

• To isolate and characterize sesterterpenes from the marine sponge Hyrtios erecta.
• To elucidate the structures and stereochemistry of new and known sesterterpenes.
• To investigate the biological activity of the isolated compounds.

Main Methods:

• Extraction of biotoxic compounds from Hyrtios erecta.
• Spectroscopic analysis including 13C-NMR and 1H-NMR.
• Chemical interconversions to confirm structures and stereochemistry.

Main Results:

• Eleven sesterterpenes were characterized, including five new scalarane sesterterpenes (compounds 2, 3, 7, 9, 10a) and five known scalaranes (compounds 1, 4, 5a, 6, 8).
• A novel norsesterterpene, hyrtial (11), was also identified.
• Structural and stereochemical assignments were confirmed using NMR data and chemical transformations.
• Compounds 9 and 10a may be artifacts of the isolation process.

Conclusions:

• The study successfully identified a diverse array of sesterterpenes from Hyrtios erecta.
• The detailed structural elucidation provides valuable data for marine natural product chemistry.
• The identified sesterterpenes exhibit potential for further investigation into their biological activities.